Sorry, you guys were right, I was not. It seems that if Bob accepts only 
one format then the Alice can rely on not receiving any other payload type.

http://www.rfc-archive.org/getrfc.php?rfc=4317

Example 2.1.

In order to allow asymmetric session, Bob should accept more than one 
format, as in example 2.2.

Regards,
-- 
Maksym Sobolyev
Sippy Software, Inc.
Internet Telephony (VoIP) Experts
T/F: +1-646-651-1110
Web: http://www.sippysoft.com
MSN: sa...@sippysoft.com
Skype: SippySoft
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